We stayed at Tib's apartment for one night. The room was as described! It was very clean, with satisfying amenities. The building is new and really safe. However, we stayed on the fourth floor and there was no elevator. This was the only problem that we had as we were carrying lot of luggages!
The apartment is 15 minutes away from the closest BTS station, and there are some 24h markets close to the building. That made our life easier.
As about Tib, she was really friendly. She was there upon our arrival and gave us many information about anything that we were asking. We really appreciated her kindness.
I do recommend 'The Arni' aparments as a really nice and cosy place to stay in Bangkok.